What you don't want to see when you are talking to your girlfriend/boyfriend.

Tom: hey babe
Tom: you there?!
Tom: hellloooooooo?!!?
Tom: ARE YOU STILL THERE?!?!?!?!?!
\Tina has signed off.
Tom: NOOOOOOOOOOOOOOOOO!!!!!!!
\The message has not been sent because the recipient is currently unavailable.